I was just curious, did you install the framework via the pkg? I, myself, drag it to my own location and reference it instead of using the pkg.
I am using ShinobiEssentials 2.7.1.hotfix1 and ShinobiGrids 2.7.2.hotfix2.
I don't know what type of Essentials you are using but I used the ShinobiDataGrid GettingStarted app and added the ShinobiEssentials framework and bundle to it and then added a sliding overlay to it. I found that after adding the ShinobiEssentials framework, I had to remove and re-add the ShinobiGrids framework for it to recognize the datagrid; after that, it ran with no errors.
I added the grid to both the overlay and underlay:
self.slidingView = [[SEssentialsSlidingOverlay alloc] initWithFrame:self.view.frame andToolbar:YES];
// Create a grid - with a 40 pixel padding for the underlay (added to overlay as well)
shinobiDataGrid = [[ShinobiDataGrid alloc] initWithFrame:CGRectInset(self.slidingView.underlay.bounds, 40,40)];